然而，只有在细菌（根瘤菌）达到一定数量时引发群体感应机制才能进行固氮。

However, bacteria fix the gas only when their population is high enough to trigger the quorum-sensing machinery.

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根瘤菌是生物固氮的能手。

Nodule bacteria are very good at biological nitrogen fixation.

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本文将探讨诱变对根瘤菌抗春雷霉素突变的作用，并对获得的抗性突变株的生物固氮特性进行分析。

This paper would explore the mutagenesis of Rhizobium mutants resistant to kasugamycin, and analyse the nodulation and fixation nitrogen character of the mutants.

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